A few minutes before the freeze whistle is blown, the staff member on duty at the play structure begins to gather children onto the blacktop area. When the whistle blows, students will freeze and squat or sit on the blacktop. When the staff members on duty feel the students are sufficiently quiet, they will dismiss students by grade to quietly walk to their class numbers and line up. Teachers will meet students and walk them quietly to class. During the line-up procedure, staff members observing students not following procedures may either alert the students’ teachers or request that the student pull a card when they return to class. All staff members will continue to model the behavior they require of their students.